Anatomy Muscle that can extend the middle distal phalanx of the index finger include all except A The first dorsal inter interosseous B The first lumbrical C The second palmar interosseous D Extensor carpi radialis longus 💡 Explanation Muscle that can extend the middle distal phalanx of the index finger include all except ✓ Correct Answer: D. Extensor carpi radialis longus